Hi M Jain
The home office will ask for proof of employment without which it will make it difficult. You see, from their perspective, they will give ILR to people who are not a burden on their system. Your wife is now your dependent but they are likely to frown on the fact that she is now unemployed. Your wife maybe better off appearing in person , this does cost more but also you get the decision on the same day. If they do not give ILR, they will not charge anything. This is how I did it but my circumstances were different.
Hope this helps
R Gupta